Sentence A declares that we don’t do many activities at once, but just switch from one to the other. Sentence C talks of the cost of switching attention. C follows A. Sentence B talks of multi-tasking, saying that it makes us demonstrably efficient, and increases our cognitive performance. Sentence C, however states that every time we switch attention, we “pay” a metabolic cost in glucose, suggesting that switching attention is a drain on our physical resources. Sentence D asserts that switching attention is an “expensive” brain activity. This ties in with sentence C. D possibly follows C. We also see that B contradicts D. D suggests switching attention is an “expensive” brain activity, while B states that multitasking increases cognitive performance. ACD make a paragraph. B is the sentence to be eliminated. Correct Answer: Choice (b)
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